"Game of Thrones" is about to end but HBO does not want to leave its cash cow behind when the original show concludes. While HBO has done great at replacing shows like "The Sopranos," "The Wire," and "Deadwood," it seems that the audience for "Game of Thrones" is too great to leave behind. As a result, HBO has lined up four different spin-off possibilities with four different writers working on the shows. David Benioff and Dan Weiss, who currently produce the original series, will produce any of the spin-offs that HBO decides to go with.

The end of "Game of Thrones"

The end is coming for "Game of Thrones." After Season 6 ended on HBO, Benioff and Weiss said that they planned to end the series with around 10-15 episodes split over two more seasons.

Season 7, which is coming up next, will be a shortened season and then the George RR Martin story will wrap up with the eighth season. There are a ton of theories on how the show will end, from the reveal of Jon's parents, whether or not Jon and Daenerys hook up, what happens to Tyrion, and more. However, when it comes to the spin-off series, there is no telling what direction they will go, whether they will be prequels or sequels, or if they will just be new stories in the same world as the popular HBO series.

Who is working on "Game of Thrones" spin-off series?

As mentioned, there are different writers working on each possible "Game of Thrones" spin-off series. The first writer is Max Borenstein. He has worked on the Showtime adaptation of the Steven Spielberg movie "Minority Report." He also has worked in movies, writing the 2014 making of "Godzilla," recent hit movie "Kong: Skull Island," and the sequel to "Godzilla" titled "Godzilla: King of the Monsters." The second is an impressive team that includes Jane Goldman ("Stardust," "X-Men: First Class") and none other than George RR Martin.

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The involvement of Martin makes this one very interesting.

The net is Brian Helgeland, who is an Oscar-winning screenwriter for "L.A. Confidential" and also directed movies like "A Knight's Tale." The final writing team for the "Game of Thrones" spin-off series is Carly Way, who worked on ABC's "Mad Men" and the HBO series "The Leftovers" and George RR Martin. It is interesting to see Martin working on two of these spin-off series.

While there is no word of the actual themes of each of the "Game of Thrones" spin-off series, the reports are that each of them will explore different time periods in Westeros. They are all in development but none will move on until HBO gives the green light.